Total-proof lock for computing type-writers.



H. N. McKAY.

TOTAL PROOF LOCK FOR COMPUTING TYPE WRiTERS.

APPLICATION FILED MAYSI. 1915- I Patented-Aug. 6,19l&

.Wrwmme/ Armani! s 4 SHEETS-SHEET H. N. McKAY.

TOTAL PROOF LOCK FOR COMPUTING TYPE WRITERS.

APPLICATION FILED HAYS). 19W

Patented Aug. 6, 1918.

STATEMENT JOHN DOE CITY ITEM AMOUNT LnmTAUuEwmTAL ITEM 1 0.00 10.00

2 ITEM 10.00 10.00 25.00

0 ITEM 100.00 25.00 175.00

WITNESSES: INVEN'IOR VWM v y y Umwvw Amnms H. N. McKAY. TOTAL PROOF LOOK FOR COMPUTING TYPE WRITERS.

Patented Aug. 6, 191&

4 SHEETS-SHEET 3. 119. 2

INVENTOR Z a-n23 aux-"12 APPUCATION HLED MAY3I.19|B.

H. N; McKAY.

TOTAL PROOF LOCK FOR COMPUTING TYPE WRITERS.

APPLICATION FILED MAYZH. I9T6 1,274,? 3 1. Patented Aug. s, 1918.

4 SHEETS-SHEET 4.

WITNESSES: IN VENTOR Ma WW5! ATTORNEYS UNITED STATES 35mm OFFICE.

HENRY n. McKAY, or OAKLAND, CALIFORNIA. Assm ron 'ro rm: WAHL comran'ir, or

WILMINGTON, DELAWARE, A conronamon or DELAWARE.

T TAL-PROQF LOCK FOR COMPUTING TYPE-WRITERS.

Specification of Letters Patent.

Patented Aug.6,191 8.

Application filed May 31, 1918. Serial No. 100,990.

To all whom it may roncern:

Be it known that I, HENRI N. McKay, a. citizen of the United States, residing at Oakland. in the county of Alameda and State of ('alifornia, have invented new and useful ln'ijn'ovements' in Total-Proof Looks for Computing Type-Writers, of which the following is a specification.

This invention relates to a total proof l 19 lock for computing typewriters.

The purpose otthisdevice is to prove the roi'rertnessof'the transcript-ion of a'total 'sli'o\vn in 'aRotaliZeI-fofn coin )uting typeiivritiu machine, such asis'siiown in the It repent Ingnpplication of John C. \Valil, C

[ rial No. 84,340, tiled March 1916. v At present in key-actuated cornguting typewriters which clear back to zero y direct subtraction of complementary addition,

possible for an operator by mistake to copya wrongtotal'ou the paper even though the'oorrect total be shown III the totalizcr, and then toprocecd with a new computation without noting the error. 'Any digits re- 5" inainin 'in' the totalirlerjafter such error "fi'ause the next computation to show a wrong result, thus creatmg'a double error. Many ini'stakesare thus made, since accuracy of T work. 'do oils on the care of the operator' 80 only, an

correctness depends on a human "taneou-sly to disp 'ay both a visible andnn me immediately calling thenudi ble'signal. t attention of the-operator to the" error. Further' objects will hereinafter appear.

' The iii-volition consists of '.the parts and the construction and, com'tiinalmn of. parts as hereinaftermore fully' described and,

claimed"; haying reference to the I accompanyingiilraivmgsnn wh e fli'gui-ol'l 'is a front view of the mam carriii ef t fit-Wot :1 Remington typewriter 4-2,. f

, slioumg till illipllt'iti'lfllhflf a \\.:\lil addmg, aiidfi-gubtl'm'ting mhg-hunism and also fsh'ou'ing theapplication of the present in b0" volition.

Fig. 2 is a cross section on line 2--- 2 of Fig. 1,

20, removed.

Fig. 3 is a perspective view of the pick-up lug carried by each totalizer and one end of the arm which it engages.

Fig. -lis unenlarged front view of the cross truck actuator, showing the front coveri'n'g removed and partly broken away.

Fig. 5 is an illustration of one form of work produced by the present machine.

Fig. 6 is a side elevation of Fig. 4, showing the right-hand side plate, indicated at Fig. 7-is a side elevation of one of the to talizer gears.

Fig. 8 is a longitudinal se'ctionthrou h one set of totalizer, gears, showin all t e deep notches in alinement with the deprcssible do? Fig. 9 is a simi ar view, showing all but,

re ation to one of the deep notches in alinernent with relation to the de'pressible dog. Fig. 10 is a perspective view ing link. I e

Fig. 11 is a perspective view of the combined resetting lever and error signal. I

of the Fig. 12 is a front view of the key-levee locking-bar shown in Fi 6.'

Fig. 13 shows a modi ed form of a keylever locking mechanism Fig. 14 IS a cross-section of the main I actuator, showing the connection with the numcralkeys. I

Referring to the drawings dicates the; main totalizcr truck mounted on iirAetail, 2 inthe carriage of a Remington typewriter I upon which is applied a \Vahl adding and subtracting mechanism and particularly a model of same known as the crosslfooting machine]? This computing mechanism consists. in this instance, of a mnin actuator 3. Secured to the frame of the typewriter in the usual manner and 3 totnlizers, A", B fiand operable in con unction,thcrewith wliich are mounted on the main truck (2). and also (ma-ism of a sub-actuator 4 and u totalizer D- operable in conjunction i'erewith which is mounted uponju s'ubtruclQ-"ii called a crosstrurk. This cross-truck niin igs across the actuator 4. in unison with any of the totaluinve across the actiiator'ti. and it is automul'n'ally returned to inoperative position, with relation to the actuator 4, the moment ,izers shown'ut A, B, and (7, when these actuator 4 in unison with the arm 8.

any of the totalizers A, B, or C move out of engagement with the actuator 3.

This is accomplished in the following manner: Pivotally secured, as at (3, upon a lug 7 secured to the cross-truck 5 is an arm 8, the opposite end of which is shown in Fig. 3. This end of the arm is provided with an upwardly projecting lug 9 which is adapted to be-engagcd bv a pick-up lug 10 projecting downwardly from eachtotalizer A, B, and C Movement of the main carriage truck 2 in the direction of arrow a will first cause the first totalizer A to move into register with the actuator 3. The ick-up lug l0, mounted on the totalizer X, will simultaneously engage with the lug 9 formed upon the arm 8 and will, therefore, cause the cross-truck and totalizer D to more across its coiiperatilng T liS unitary movement of the totalizers A and D and the main carriage truck 2 and the cross truck 5 takes place as long as the totalizers are in engagement with their cooperating actuators but no longer, as the cross-truck 5 will become automatically released the moment the totalizers A and D move out of engagement with their actuators.

This is accomplished as follows: Formed on one side of arm 8 is a pin 11 which projects through a slot 12 formed in a cam track 13. This pin engages with a downwardly sloping cam surface 14, formed in the slot 12, the moment the totalizers A and D-move out of engagement with the actuators, and therefore gauses the arm 8 to become depressed about the pivot 6 and will consequently cause the projection 9 to move out of engagement with the pick u lug 10 to a position where the arm is re eased, thus permitting the eross-truck-to'return to normal position. This movement of the crosstruck, when a'rmQS is released with relation to a pick-up lug,'is transmitted through a coil spring 16 attached to one end of the cross-truck. LContinued movement of the main carriage truck will next bring the totalizer B into register with the actuator 3 and the pick-up log 10 carried by the totalizer B will simultaneously engage the projection 9 on arm Sand again cause the cross-truck and totalizer D to more in unison with the main carriage truck and the totalizer B un' til releasing position is again reached, 2'. e., wh n pin 11 engages with the cam surface 14, which as revionsly stated, takes place when one of tlie totalizcrs A, B or C move out of engagement with the actuator 3.

It can thus be seen that the tota-lizer D will, in the present instance, move across its cooperating actuator 4 three times as the arm 8, connected to its cross-truck, is picked up three times by th'ctotalizers shown at A, B and C and that the totalizer D, with con nected cross-truck will also be automatically as shown in Figs. and 6.

returned across the actuator 4 three times as the arm 8 is automatically released by the cam 14, thus permittin r the sprin 16 to retract the cross-truck am totalizer each time.

'lhe mechanism so far illustrated and described is a duplication of the mechanism employed in the model of a Wahl adding and subtracting mechanism known as the cross footing machine, as applied to the Remington typewriter. This mechanism cooperates to such an extent with the several parts of the present attachment that a descript on of same has been made to make more readily comprehensible the remaining mechanism, which comprises the novel improvements of this invention.

Mounted in alincment with the teeth of the master gear 17 of the actuator 4 is a depressible dog, 18. This dogforms one of the most important features of the present invention as it, together with gears indicated at 19 in Figs. 7, 8 and 9, pro videsthe means whereby the keys of the typewriter are locked when an incorrect transcription or error is made. The deressible dog is slidably mounted in a beat? mg 21 secured on the right-hand siderplatc 20 of the actuator 4. The upper end of the dog is slotted, as at 22, to straddle the master-gear shaft 23, and a spring 24 at tached to a. pin at one end and to the depressible dog at the other and normally holds the dog in the raised positionshown in F1 6, in which normal position it. is at a su cient height so that it will be de ressed by the passage of any normal note ,0? a totalizer gear. Each totalizergear mean n the totalizcr D and operatin in con- Junction with the actuator 4 and t o depressible dog 18 is provided with three or more notches 25 having a ater do th than those notches which are tlih norma gear teeth indicated at 26. ,These deep notches will not depress the dog 18 and this fact makes ossible the proof of totals later to be descri ed. a i

From the description previously madqtit will be remembered that the totalizer D moves across the actuator 4 in unison with each of the totalizcrs, indicated at A, B and C, and also that the totalizor is automati Cally returned with theQttrOSs-tl'UCk 5, by means of the retracting spring 16, whon'the arm 8 is released. It can thus be seen that all the totalizer gears, here shown as being 9 in number (Ssee Figs. 8 and 9 have to travel back an forth across the. epressible dog 18 and the main driving gear 17 of the actuator 4 during the operation of the comthe totalizer' depthof theverse movement of the totalizer D ishti lized to operate a mechanism which, under when an error is made. This is accomplished as follows: 27

represents the rocker-shaft in the actuator 4 which is operated by the numeral keys 80 whenever they are depressed while the computing mechanism is in use. Secured on one end of said rocker-shaft is a projecting lug 28, and pivotally mounted on the side plate 20, as at 29, 1s a blocking latch 30, the lower end of which is adapted to be moypd into and out of engagement with the lug -28. Engageable with the upper end of the latch is a cotiperating latch 31, pivotally mounted on the side plate as at 32. This latch normally engages the upper end of latch 30 to hold the lower end of said latch out of engagement with relationto lug 28. This is accomplished by attaching a sprin 33 to the opposite end of a latch 31.

Slit ably mounted between the side plate 20 and the opposite plate 20 of the act'uator 4, at right angles to the plane of the cooperating latches 30 and 31 and the lower end of the depressible dog 18, is a sliding link 34 (see Figs. 4 and 10) and pivotally mounted, as at 35, at one end of said sliding I link is a filler plate36 which, during certain predetermined time intervals is adapted to occupy a position intermediate of the latch 4 31;.and the lower end of the depressible dog 18. The depression of the dog, when this filler plate is in such, intermediate position will trip thelatch 31 or move it out of en-' g'agement with relation to latch 30 and will simultaneously permit. the latch 30 to assume the dotted "line position indicated at, 30 where it,would engage the lug28, thus locking the ,"roc (Er-shaft 27 aga nst movement and all'lof t e numeral keys against movement as these are direct] connected with the rocks shaft as shown in Fig. 14.

Secur toshaft 29 is a re-setting lever 37, one end of which projects thronghthe actuator casing, as indicated at 38, this serves also as a visual error si al.j Said lever norm'all assumes the fill line position shown in Fig. 6 and the outer end is then concealed b a closure or cup 39. Any movement of tlie latch 30 from the full line to the dotted line position shown causes the resetting lever to move in unison' withsame to assume the dotted lineposition indicated at 38' where it produces both a visible and, as hereinafter described, an audible signal to the operator that an 'error has been made. The -typistmay this correct the error before any harm. results from it,

The manner oimaking the correction will be described later.

' Ia order. to illustrate more awa the operation of the machine and the value of this device, a sample of one of the many classes of work accomplishedby the-present mil-*- to keep totaled at all times. so that the last. amount in the new total column will always show the sum of all items entered on the statement to date. This is accomplished by writing the previous or old total after entering a new item, and having the com putiug mechanism indicate in the cross footing totalizc'r D the sum of the old total plus the item, which of course is the new total required, and is written in the new total column.

To handle the above class of typical problems air equipment of totalizcrs is used such as are illustrated in the drawings shown herewith. The totalizcrs. A. B and C. which are termed the vertical totalizcrs. cover respectively columns u. b and c on the statc ment illustrated. and their purpose is to accumulate the sums of all amounts typed in their respective columns. sums to he used for proving the work ,and not having to do directly with the present case. Totalizcr D, as previously described, covers each column successively, and its purpose is to combine an amount, typed in column u ivith ,an amount ty )c'd in column 1). showing afsum to be typcr in column 0.

i In other words, any amount typed in column a accumulates in totalizcrs A and D. Any amount typed in column 7) accumulates in totalizers B and D. After, typingone amount in each of these columns, totalizer D- will show the sum of those two amounts, which sum is then typed in cohunn 0,.whereupon the totalizer D; will be cleared or brought back to all zeros by subtraction, provided said sum be typed correctly.

If incorrectly typed, totalizer D will not be cleared, but will contain certain remaining digits, and a new total other than the true one will be shown in error on thestatoerror-that the present invention has been 4 develo ed.

Wit a statement such as. illustrated insertedin the machine, the operator will proceed as follows; Afmrlyp g the date and detail of the first item, the amount. of this item, which is $10.00 ist ped in column a, and is added both in tota izer A" and in the cross-footing totalizcr I). Thisbeing the first itetn,. there is therefore no" old totalto be typed andthis amount of $10.00 is, the, first total and is written down in column 1:, the new total column. Totalizer D returns to 'zeros. since .fthe amount was correctly typed. alater date thesta-tement is reinserted'in 't-hemachine and the second item is added mic. The operator as before types the date and detail of the second item and enters the amount of the second item, which is $15.00, in column a, and then. copies from the line above the first total, or $10.00 in column b, whereupon totalizer D shows the combined sum of these. two amounts, or $25.00. On correctly typing this sum in column 1', totalizer D returns to zeros as before.

The computing mechanism is automati (ally or manually actuated lit-fore each total is written in column 1' so as to change the controlling gears in the actuator l to subtract. position. 7

As illustrated in Fig. 5, the lotalizer gears 19 of the totalizer l) have certain notches 25 cut deeper or larger than the relnainine not hes. These deep notches 25 are the only notches in these gears of suf licient depth or siz e to clear the dog 19 in passage, without depressing it. These deep notches are so positioned that a complete series of them will he lined up as in Fig. 8, opposite the depressible dog 18 when, and only when. a series of all zeros is shown in the number wheels of the totalizer I). \Vhen all deep notches are thus in line, the totalizer D may be retracted across the depressible dog, after typingan amount without'causing the dog, to be depressed. Since any crroe nade in'the' transcri tion of the new totalfrom totalizer D in co umn a will cause one or more digits to remain in the number wheels of the totalizer. it. follows that all the deep notches will not he. 35

in line and that. certain small notches will he left-in line with the dog 18, as in Fig. 9, thus causing the dog to be depressed when the totalizer is retracted by its spring across the dog. a

Since the depressible dog 18 will be depressed whenever tot-alizer I) is retracted with an amount shown therein, and since in the illustrated work of the machine it. is necessary thattotalizer l) be retracted while containing an amount after typingin either column a. or column bfit, is evident that the' dog 18 inust. he (lepressible in these columns without releasing the ciiiperating latches 30 and 31 but that means must be provided so that depression of the dog 18 after operating in column a will cause the latches to be released.

This is accomplished in the. following mural key in this last S ace of the totalizer as before describe, automatically releases the cross-truck which returns to rest position at the right side of the depressihle dog 18. The i'lepressiou ot the ell-erank 41, by means of the cam -10, causes the slidin link 34 (see Figs. 4 and 10) to more in t c direction of arrow (1 a sutticient distance to bring the filler plate 36 into alinemcnt between the lower end of the depressihle dog and the latch 31. This movement of the sliding link takes lace in unison with the depression of the be l-crank 41 as the hell-crank is directly connected with the sliding link through means of a centrally pivoted lever 42 and a link 43 00 Fig. 1). If, therefore, an error is made when typin in column 0 the total acrunullated in tota izer D, one or more digits will remain in totalizcr D instead of all zeros. The deep notches'in the totalizer gears 19 will therefore not. aline and the smaller notches left. by the error will cause the dog 18 to become do ressed when the cross-truck is released an retracted to rent position on the right side of the dog. The release and. return movement of the CIOSo" truck, carrying the. totalizer D, takes, place during the time Jeriod when the bell-crank 41 is depressed y the cam 40' andwhen the tiller plate 36 is in alinementbetwcen the lower end of the depressible dog and taneously more, into display position, thus its movement fromthe full line position to g ivin visual si an! of error. An audible. sign'a. .Wlll also e given as the lever 37, in"

the dotted line. position shown m .Fig. engages the clapper 50 of abell 51 carri;

by the actuator 4.

Means have thus been provided for locking the numeral keys against, further operation if an error is made, andifor sinml taneously di layin a visible signal and giving an an ible :1 arm, making it i|npoesible for. the operator to rocccd without" noting the mistake. As a. urther meansto prevent continued operationpf the machine. should the operator fail to heanthe audible warninfi or see the visible error signal, means are been provided for lockin the remaining keys of the typewriter. T is is accomplishcd'in one instunce by formin a projection 53 on th'e lower.'side of cacti get ter key-lever 54 and by pivotally mounting,

below the key bars 5a, a bail-shaped crossbar 55 which will be projected into the path of movement of the projections when the This is accomplished by securing a crankarm on the shaft 56 which carries a bail.

55 and connecting said crank with the signal lever 37 by means of a link 57. It is thus possible to lock all the keys against movement and simultaneouslv to give an audible signal and invisible indicationl Further operation of the machine is Justtively prevented until the error is note for correction.

Correction is accomplished in the followin r manner: The operator, having been noti led of the error, manually raises the resetting lever 37 to its rest position under the concealing cap 39, said cap acting as a stop also to the movement of the hand. The resetting lever, being rigidl connected to the latch through the'sha t 29, in .its return movement restores latch 30 to its original position, where it is again held by the cooperating latch 31, which again resumes its original position impelled by its spring 33. By this operation all warning signals are manually removed, and the. machine. is =-'agam operable. The operator then corrects the error in the usual manner provided for the purpose in such machines, which is by manually reversing the controlling gears of the actuators, repeating the error, thus restoring the correct amount to the totalizers wrongly operated in, and then, after ne'cessary erasure, copying the total correctly. A

scconderror will cause a second lock.

Inexperienced operators have not infre' quently been known to make the mistake of neglecting to copythe correct amount after hav ng performed the first part of the correction operation and having restored the right amount to the totalizer. This over- .vfilglll? .is prevented by the invention above described since the machine becomes locked aga nst operation and the various error si pals are again shown when the totalizer file-M05888 .its actuator with the correct 'jamount-shown inv it. Asecond manual resettingfif the lever 37 -is required before -wl iti 1 1'g the final correct totalpand if this isneg'lected the locked condition'of the keylovers will bring the oversight to the 0perators attention .onattempting to write any letter or figure of a succeeding piece of a; :his mechanism may be preferable as it perwork.

'A modification of the key-lever locking mechanism shown 'b reference characters 53 and 54 is shown in ig. 13. The shaft 56 is here provided with a plurality of comb-like. projections 58 which are adapted to be moved into or out of the path of travel of tea more compact arrangement than that "own in Fig. 6.

it "Since it may at times be necessary or deinoperativeat will.

This is accomplished as follows:

Slidably mounted on the inner side of the cover inclosing the actuator -'l is a shoe 76, see Figs. 1 and (i. This shoe is provided with a knob TT projecting through a slot 78 formed in the rover. If it is desired to render the automatic locking mechanism inoperable, it is only necessary to grasp the knob 77 aml move the shoe in the direction of arrow 11. until the forward end of the shoe projects under the resetting lever 38 as shown in Fig. ti. This looks the lever with connected shaft 29 and latch 30 against movenu-nt and therefore renders the locking mechanism iuo n-rable. however, be depressed and the latch 31 rocked about its pivot without releasing the latch 30 as the. latch 30 is secured The dog 18 may to the shaft. 29, and as the shaft. 29 carries the resetting-lever 38, which in this instance is locked, it will be seen that thelocking mechanism, as a whole, is rendered inoperable.

Thc depressible dog is tied by the actuator 4. This arrangement here shown as carmay, howevcr,be lnodilied as it. may be -reachcd a particular position 't'or proving brought into the correct transcription of a total shown in the totalizer.

In a computing typewriter having arceording mechanism and a calculating mechanism and certain keys operating the recording mechanism only and other keys common to both mechanisms, the combina tion with the calculating mechanism of meanso erative on transcribing a wrong result 0 a calculation foxlocking against further operation the, keys operating the recording mechanism.

I: 3. In a computing typewriteehaving a recording mechanism and a calculating mechanism and certain keys operating, the recording mechanisnronly and other keys common to both mechanisms, thecombir" nation with the calculating mechanism of means operative on transcribinga wrong result of a calculation for locking against further operation both the keys operating the recording mec ianisin and the keys operating the ca culating mechanism.

4. In a computing typewriter having a recording mechanism and calculating mechanism and ccrtau keys operating the recording mechanism only and other keys common to both mechanisms, the combination with the calculating mechanism of means operative on transcribing a wrong result (if a calculation for locking agalnst furthe operation, the keys operating the calculating mechanism.

5. In a computing typewriter, the combination with the numeral keys, the carriage, the actuating mechanism and the totalizer therefor, of means controlled by the totahfi'er for automatically displaying a visible signal when a wrong total is copied from the totalizer.

6. In a computing typewriter the combination with the numeral keys, the carriage, the actuating mechanism and the totalizcr therefor, of means controlled by the totalizer for giving an audible signal when a wrong total is copied from the totahzer.

7. In acomputing typewriter the combination with the numeral keys, the carriage, the actuating mechanism and the totalizer therefor, of means controlled by the totalizer for locking the actuating mechanism against. further operation when a wrong total is copied from the totalizer.

8. In a computing typewriter the combinution with the numeral keys, the carriage, the actuating mechanism and the totalizer therefor, of means controlled by the t-otalizer for locking the actuating mechanism against further operation when a wrong total is copied from the totalizer and means for manually releasing said lock.

9. In a computing typewriter the combination with the numeral keys, the carriage, the actuating mechanism and the totalizer therefor, of means controlled by the totalizer for locking the numeral keys against further operation when a wrong total is copied from the totalizcr.

10. In a computing typewriter the combination with the numeral keys, the carriage, the actuating mechanism and the totalizer therefor, of means controlled by the totalizer for locking the numeral keys against further Obttl'jltltlll when a wrong total is copied from the totalizer and means for manually relcasiug said lock,

ll. In a computing typewriter, the combination with the numeral keys, the carriage, theactuating"mechanism and the totalizer therefor, of means controlled by the totalizer for displaying a visible signal when a wrong total is copieu n-om the totalizer, and means for manually removing, the visible signal.

12. In a calculating machine, the combination with a set of, digit keys, actuating mechanism, a plurality of totalizers cooperatmg with said actuating mechanism and adapted to compute numbers in a series of vertical columns, a cross totalizer adapted to perform horizontal addition, means to bring said cross totalizer successively into cooperation with said vertical totalizers, and means controlled by said cross totalizer for automatically displaying a visible signal when a wrong total is copied from said cross totalizer.

13. In a typewriter calculating machine, the combination of a setof digit keys, actuating mechanism, a plurality of vertical totalizers, a traveling carriage to bring said totalizers successively into cooperation with said actuating mechanism, a cross totalizer adapted to be brought into cooperation with said actuating mec anism concurrently with said vertical tot'alizers, and means controlled by said cross totalizer for giving an audible signal when a wrong total is copied from said totalizer by said digit key.

14. In a typewriter calculating machine, the combination of a set of digit keys, a traveling carriage, a plurality of vertical totalizers mounted on said traveling carriage, actuating mechanism, a cross totalizer, means to brin said cross totalizer into cooperation wit an of said vertical totalizers when said vertical totalizers are actuated by said actuating mechanism, and means controlled by said cross totalizer for locking said actuating mechanism against further actuation when a 'wron total is copied from said cross kfiilizer liy means of said digit keys. I

15. In a typewriter calculating machine, the combination of a set of digit .keys, a traveling carriage, a plurality of vertical totalizers mounted on said traveling can l'iage, actuating mechanism, a cross totalizer, means to brin said cross totalizer into cooperation wit any of 'said vertical totalizers when said vertical totalizers are actuatcd by said actuating mechanism, means controlled by said cross totalizer for lock-I ing said actuating mechanism againstfurther actiiation when a wrong total is copied from said cross totalizer by means of said digit keys, and means for manually releasing said lock.

16. In a typewriter calculating machine, the combination of a set of digit keys, a traveling carriage, a plurality of vertical totali'liers mounted on said traveling carriage,

actuating mechanism, a cross totalizer, means to bring said cross totalizer into .cooperation with any of said vertical totalizers when said vertical totaliz'er's are actuated by said actuating mechanism, and means controlled by said cross totalizer for look ing one of-said digitrkeys against lfur-ther operation when a wrong total is copied irom said totalizer by mea e's, 0} said keys.

17. in a computing typewriter the combination with the numeral keys, the letter keys. the carriage. the actuating mechanism and a plurality of totalizers therefor of means controlled by a totalizer for locking the. actuating mechanism against further operation when a wrong total is copied from a totalizer and means for manually releasing said lock.

1 In a typewriter calculating machine, the combination of letter keys, digit keys. I a traveling carriage. a plurality of vertical totalizers, the relation of said vertical totalizer's and said actuating mechanism heiug such that the point of operation of said actuating mechanism on said vertical totalizers is determined by said traveling can riage. a cross totalizer adapted to he actuated by said actuating mechanism simul taneously with the aetuationof any of said vertical totalizers, and means controlled by said cross totalizer for locking said letter keys against further operation when a wrong total is copied from said cross totalizcr. v

i 19; In a computing typewriter the comhination with the letter keys. the carriage, the actua ,mg mechanism and a ])lltl':Lllt of toti'dizers therefor of means controlled. by adtotalizer for locking the letter keys against further operation. when a wrong totalv is copied from a totalizer and means for manually releasing said lotdc.

20. In a computing t \pe\\'riter the combination with the nluueral keys, the letter keys, the carriage, the actuating mechanism 7 and a plurality of totalizers therefor of means controlled by a totalizer for locking both tlu- MnmneraL keys and letter keys against further operation when a wrong total is copied fronra totalizer.

. 21. In a computing typewriter the combination with the numeral keys, the. letter keysythe carriage, the actuating mechanism and a plurality :of totallzers therefor of means controlled by a totalizer for locking both the numeral keys and letter keys against. .further operation when a wrong total is copied from a totalizer and means for manually releasing said lock.

22, In a computing typewriter the combination with the keys, the carriage, the actut'ltlllg -lllt(flttllll$lll and the totalizcrs therefor oi"v means for displaying a. visible signal yvhenia. wrongtotal is copied from a total lzer, l w

; 23. In a computing typewriter the combination with the keys, the carriage, the actuating mechanism and the totalizcrs therefor of meansfor producing an audible signal when. a wrong total is copied from a total izer. V 2t. In a computing typewriter the combination with the keys, the carriage, the actuating mechanism and the totalizcrs therefor of means for locking the actuating mechanism against further operation when, a wrong total is copied from a totalizer.

25. In a computing typewriter the combination with the keys, the carriage, the actuating mechanism and the totalizcrs therefor of means for locking the actuating mechanism against further operation when \a 'wrou total is co )iecl from a totalizer and -total is copied from a botalizer and means for manually releasing said lock.

28. In a computing typewriter the combination with the numeral keys, the letter kcys,,the carriage, the actuating mechanism and a plurality of totalizerstherefor of means for locking the letter keys against further operation when a wrong total is copied from a totalizer.

29. In a computing typewriter'the combination with tie numeral keys, the letter keys, the carriage, the actuat-ing'mechanism and a plurality of totalizers therefor of means for locking the letter keys against further operation when a'wrong total is copied from a totalizer and means for manually releasing said lock.

' 30. In a computing typewriter the combination with the numeral keys, the letter keys, the carriage, the actuating mechanism and afplnrality of totalizers therefor of means for locking; both the numeral and letter keys against further operation when a wrong total is copied from a totalizer.

, 31. In a com uting typewriter the combination with t c numeral keys, the letter keys, the carriage, the actuating mechanism and the totalizers therefor of means operable in the event of transcribing a wrong total from a. t-otalizer for locking the actuating mechanism, the numeral ,keys and the --lcttcr keys against further operation 'andfmcans operable in conjunction therewith for p oducing both a Visible and an audible signa 32. Inba computing typewriter the combinatiomwitlr the numeral keys,,the letter keys. the carriage, the actuating mechanism and the totalizcrs therefor of means operable in the event: of transcribing a wrong,

total from a totalizer for locking the actuating mechanism,- he numeral keys, and

'the letter keys aga nst further operation, means operable in conjunction therewith for producing both a visible and audible signal and means for manually releasing the key-locking mechanism and for removing the signals.

33. In a com muting typewriter the combination with tie numeral keys, the letter keys, the carriage, the actuating mechanism and the totaliz ers therefor of means operable in the event of transcribing a wrong total from a totalizer, for locking the actuating mechanism, the numeral keys, the letter keys against further operation, means operable in conjunction,therewith forrproducing both a visibleiind audible signal and means for rendering all said locks and signals inoperable except at prcdetermineil points along the writing line of the typewriter.

34. In a computing typewriter the combination with the numeral keys, the letter keys, the carriage, the actuating mechanism and the totalizers therefor of means operable in the event of transcribing a wrong total from a totalizer for locking the actuating mechanism, the numeral keys, the letter keys against further operation, means operable in conjunction therewith for producing both a visible and audible signal, means for manually releasing the locking mechanisms and for removing the signals, and means for rendering all said locks and signals inoperable ei eept at predetermined points along the writing line of the typeit v i I,

; 35. In a computing typewritmg machine the combination with the keys and carriage thereof and the actuating mechanism of a' depressible dog carried by the actuating mechanism, and a plurality of carrying gear wheels having a plurality of shallow and deep notches iormeyl therein, carried by a botalizer having a laterally changeable relation to the actuating mechanism, each of said gear wheels adapted to deprem the dog during a "change in said lateral relation when a small notch is in alinement therewith but incapable of depressing the dog when a deep notch is in ahnement with the 36. In a computing typewritin machine the combination with the keys am carriage. therefor of a totalizer having a plurality of numeral wheels and carrying gear wheels mounted therein; an actuating mechanism operable in conjunction with the totalizer, and bearing a laterally movable relation to it and a member adapted to bedepressed by the saidt0talizer gear wheels in passage when the uineral wheels bear certain rela tions to eacn other and non-depressible by said gear wheels in passage when said numeral wheels have certain other predetermined positions with relat-ion'to each other.

37. In a computing typewriting machine the combination with the keys and carriage therefor of totalizcrs having a plurality of numeral wheels and gear wheels mounted therein; an actuating mechanism operable in conjunction with the totalizers, and hearing a laterally movable relation to it, and a member adapted to be depressed by the totalizer gear wheels in passage when the numeral wheels bear certain relations to each other and non-dcpressible by-said gear 7 wheels inpassage when said numeral wheels have certain other predetermined positions with relation to each other and means controlled by depression of said member for locking the numeral keys against further OPBHIUOIL, Y

"' 38. In a computing rypewriting machine the combination with the keys and carriage therefor of totalizers having a plurality of nluneral wheels and gear wheels mounted therein; an actuating mechanism operable in conjunction with the totalizers, and a member adapted to be depressed by the total izer gear wheels in passage when the numeral wheels bear certain relations to each other and nondepressible by said gearanism the combination with the carriage;'

the actuating mechanism therefor and its master gear wheel, of a totalizcr having a plurality of gear wheels mounted therein, each of said gear wheels being provided with one or more notches of greater dc th than the normal depth of the gear teet means for moving the totalizer across the master gea r, a dcpressible dog mounted adjacent the master gear adapted to be do ressed by the gear wheels except when the eepcr notches are in alinement therewith; a retaining latch, a lockin latch coacting with same, capable of bloc ring the operating movement of the actuating mechanism and means operable by the typewriter carriage when the same passes certain predetermined points with relation to the printing point of the typewriter, to enable movement of the depressible dog to operate the retaining latch so as to release the locking latch to permit the same to move into locking position.

40. In a computing typewriting mechanism the combination with the carriage; the actuating mechanism therefor and'its master gear wheel, of a totalizer having a plurality of gear wheels mounted therein, each of said gear wheels being provided with a notch of greater depth than the normal depth of the gear teeth, means for laterally moving the totalizer with relation to the master gear, a depressiblc dog mounted adjacent to the master gear adapted to be depressed by the gear wheels except when the deeper notches are in alinemcnt therewith; a retaining latch, a locking latch coaeting with same, capable of blocking the operating movement of the actuating mechanism, means operable bv the typewriter carriage when the same occupies certain predetermined positions with relation to the print ing point of the typewriter. to enable move- "ment of the depressible dog to operate the retaining latch so as to release the locking latch to permit the same to move into locking position, and means for manually restoring the locking: latch to released position.

41. In a computing typewriter having a recording mechanism and a calculating mechanism and certain keys operating the recording mechanism only and other keys common to both mechanisms, the combinw tion with the calculating mechanism of means operative on transcribin a wrong result of a calculation for liciing against further operation the keys operating the recording mechanism and manually controlled means for rendering said locking mechanism inoperable.

42. In a computing machine, the combination of a totalizer, locking mechanism actuated by the totalizer when said totalizer does not' stand at zero to lock and render the computing mechanism inoperable, and means for rendering said locking mechanism inoperable.

43. In a computing machine, the combination of a. totalizer, locking mechanism actuated by the totalizer when said totalizer does not stand at zero to lock and render the computing mechanism inoperable, and manually controlled means for rendering said lockin mechanism inoperable.

44. In a computing machine adapted to compute in several columns, the combination with the actuator and totalizing mechanism therqo'fiof means controlled by' the totalizing mechanism for locking the machine agninst further operation when a. wrong total is transcribed, and means to make said locking means operable in certain columns and not in others.

45. In a calculating machine. the mmbination with digit keys, :1. totalizer, means for transcribing a total from said totalizer, said means being 0 rated by said digit keys and means control ed by said totalizer for locking said digit keys when a wrong total is transcribed from said totalizer.

46. In a calculating machine, the combination of a pluralit of totalizers, a set of ,digit keys, means or transcribing a total in certain columns, and means controlled by said totalizers for locking said digit keys when a wrong total is transcribed in a. certain column.

47. In a combined typewriting and computing machine, the combination of a set of keys, a plurality of totalizers, and means controlled by said keys to transcribe a total in a certain column and means controlled by said totalizers tor lockin said'keys when a wrong total is transcri d in a certain column.

48. In a combined typewriting and com- )uting machine, the combination of a set of eys, a plurality of totalizers, and means controlled by said totalizers for automatically displaying a visual warning signal when an error is made in transcribing a total. i 49. In a typewriter CalcuIatingmachine, the combination with a set of digit keys, a plurality of totalizers. means operated by said keys for transcribing a total, and means controlled by said totalizers for giving an audible. alarm when the wrong keys have been struck in transcribing a total.

50. In a computing typewriter the combination with the main carriage truck and the cross truck of an actuator mounted adjacent each track, a plurality of totalirers mount.- ed on themain truck and operable in conjunction with the adjacent actuator, totalizers mounted on the cross truck and operable in conjunction with the adjacent actuator, a pluralit of totalizer gears in the .cross truck total izers having small and deep notches formed therein, a d mounted in the cooperating actuator a apted to be depressed by said notched totalizer gears except when none but the deeper notches in 400 the gears are in alinement with the dog, means controlled by the movement of the main carriage. when at certain positions, for moving a latch member into allnement with the deprcssible dog to permit said latch to be dept-owed if the dog is depressed, and means operated by depression of said latch for locking the keys of the typewriter against movement.

51. In a computing typewriter, the conibination with the numeral keys, letter keys, carriage, and actuating mechanism thereof, of one or more totnlizers adapted to travel laterally across the actuating mechanism, and means operable by the lateral movement of a totalizer to prove the correct transcription of a total shown in that totalizer.

52. In a computing typewriter, the combination with the numeral keys, letter keys, carriage, and actuating mechanism thereof, of one or more totalizers adapted to travel laterally across the actuatin and means operable by the stern] movement of a totalizer to lock the numeral keys against further operation until manually released if an incorreetatbtal is copied from carriage, and actuating mechanism thereof,

mechanism, a

numeral keys. a

0 carriage,

55 bination wit-lithe numeral keys,

so ment ofa totalizer to give '15 against further operation until manually released if an incorrect total is copied from that totalizer, and means to make said lock operable only at certain points of the writing line.

55. In a computing typewriter, the combination with the numeral keys, letter keys, carriage, and actuating mechanism thereof, of one or more totalizers adapted to travel laterally across the actuating mechanism, and means operable by the lateral movement of a totalizer to lock the letter and numeral keys against further operation until manually released ii an incorrect total is copied from that totalizer, and means to make said lock operable only at certain points of the writing line.

56. In a com uting typewriter, the com: bination with t e numeral keys, letter keys, carriage, and actuating mechanism thereof,

5 of one or more totalizers adapted to travel laterally across the actuating mechanism, and means operable by the lateral move 'ment of a totalizer to display a visible mechanical signal until manually removed when an incorrect total is copied from that totalizer.

57. In a computing typewriter, the combination with the numeral keys, letter keys, carriage, and actuating mechanism thereof,

5 of one or more totalizers adapted to travel laterally across the actuating mechanism, and means operable by the ateral motement of a totalizer todisplay a visible mechanical signal until manually removed when an incorrect total is copied from that totaliaer and means erable'only at certain points of the writing to make said signal opline. d

58. In a computing typewriter, the comletter keys, carriage, and actua ingiuechanism thereof, of one or more tota izers adapted to travel e ly across the actuating mechanism, iiffid m 'nsoperable b the lateral movean audible warning when an incorrect total is copied from that totalizer.

letter keys,

-laterally across the actuatin 59. In a computing typewriter, the combination with the numeral keys, letter keys, carriage, and actuating mechanism thereof, of one or more totalizcrs adapted to travel laterally across the actuating mechanism, and means operable by the lateral movement of a totalizcr to give an audible warning when an incorrect total is copied from that totalizer and means to make said warning operable only at certain points of the writin line.

60. n a computing typewriter, the combination with the numeral keys, letter keys,

carriage, and actuating mechanism thereof.

of one or more totalizers adapted 'to travel-- laterally across the actuating mechanism,"

and means operable by the lateral movement of a totalizer to lock the actuating mochanism against further 0 eration when an in" correct total is copied rom that totalizer.

61. In a com uting typewriter, the combination with t e numeral keys, letter keys, carriage, and actuating mechanism thereof, of one or more totalizers adapted to travel laterally across the actuatin mechanism, and means operable by the ateral movement of a totalizer to lock the actuating mechanism against further operation when an incorrect total is copied from that totalizer and means for manually removing said lock.

62. In a computing typewriter, the combination with the numeral keys, letter keys, carriage, and actuating mechanism thereof, of one or more totalizers adapted to travel mechanism, and means operable by the ateral movement of a totalizer to lock the actuating mechanism against further 0 ration when an incorrect total is copied from that totalizer and means for making said lock operirble only at certain points of. the writing 63. In a typewritercalculating machine, the combination of numeral keys, a traveling carriage, actuating mechanism, izer,'said totalizer and actuating mechanism being so arranged that numbers are inserted in said totalizer in the decimal place determined by said traveling carria e, and means controlled jointlyi'by said tota izer-and said traveling cargiage-ifgr autonmtically displaying a visl le'si I when a wrong total is copied from the totalizer;

In testimony whereof I have hereunto set my hand iirthe presence of two subscribing witnesses.

HENRY N. MoKAY.

Witnesses:

J mm H. Hmuuno, W. W. HEALEY.

a total 

